HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Physics

A potentiometer wire has a length of 1.5 m and a resistance of 10 Ω. It is connected in series with the cell of emf 4 Volt and internal resistance 5 Ω. Calculate the potential drop per centimeter of the wire.

A potential drop per unit length along a wire is 5 × 10⁻³ V/m. If the emf of a cell balances against length 216 cm of this potentiometer wire, find the emf of the cell.

Find the equivalent resistance between the terminals of A and B in the network shown in the figure below given that the resistance of each resistor is 10 ohm.

If a = 0.72 and r = 0.24, then the value of t_r is ______.

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What will happen to the mean square speed of the molecules of a gas if the temperature of the gas increases?

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A gas in a cylinder is at pressure P. If the masses of all the molecules are made one-third of their original value and their speeds are doubled, then find the resultant pressure.

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Show that rms velocity of an oxygen molecule is `sqrt2` times that of a sulfur dioxide molecule at S.T.P.

At what temperature will oxygen molecules have same rms speed as helium molecules at S.T.P.? (Molecular masses of oxygen and helium are 32 and 4 respectively).

Answer in brief:

Compare the rms speed of hydrogen molecules at 127°C with rms speed of oxygen molecules at 27ºC given that molecular masses of hydrogen and oxygen are 2 and 32 respectively.

Choose the correct option:

The graph shows variation of displacement of a particle performing S.H.M. with time t. Which of the following statements is correct from the graph?

What will be the effect on the position of zero deflection if only the current flowing through the potentiometer wire is decreased?

Answer in brief:

State the characteristics of stationary waves.

An electron, a proton, an α-particle, and a hydrogen atom are moving with the same kinetic energy. The associated de Broglie wavelength will be longest for ______.

State the importance of Davisson and Germer experiment.

What is the speed of a proton having de Broglie wavelength of 0.08 Å?

Answer in brief.

State the postulates of Bohr’s atomic model.

Derive the expression for the energy of an electron in the atom.

In an ideal gas, the molecules possess ______.

If the density of oxygen is 1.44 kg/m³ at a pressure of 10⁵ N/m², find the root mean square velocity of oxygen molecules.

When a gas is heated, its temperature increases. Explain this phenomenon on the basis of the kinetic theory of gases.